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Simplistic NJFET RIAA
Simplistic NJFET RIAA
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Old 21st October 2012, 10:41 AM   #8271
MASantos is offline MASantos  Portugal
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6.5mv
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Old 21st October 2012, 01:02 PM   #8272
RCruz is offline RCruz  Switzerland
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Simplistic NJFET RIAA
Hi Salas

Just powered first stage of the "experiment" and got 8v on BC560c emitter... is this ok ?

I am measuring 7.5v at the base so the ccs is working fine.
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Last edited by RCruz; 21st October 2012 at 01:07 PM.
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Old 21st October 2012, 01:10 PM   #8273
Salas is online now Salas  Greece
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Simplistic NJFET RIAA
Orientation OK? Emitter towards the Jfets drains underneath? Is there big voltage drop on the resistor between power rail and those drains? That means there is bias to them.
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Old 21st October 2012, 01:11 PM   #8274
Salas is online now Salas  Greece
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P.S. We look for emitter voltage to ground, not Vbe.
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Old 21st October 2012, 01:17 PM   #8275
RCruz is offline RCruz  Switzerland
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Simplistic NJFET RIAA
Emitter to gnd is now 8.1V... collector to gnd is 4.05v

24.5v Vdrop on the 1k5 resistor (R13)

PS: On the first post I just correctd, I did not have the Gates of the input k170 grounded..... sorry
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Last edited by RCruz; 21st October 2012 at 01:20 PM.
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Old 21st October 2012, 01:18 PM   #8276
Salas is online now Salas  Greece
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So its ok, no panic for now. Boom and smoke comes a bit later.
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Old 21st October 2012, 01:21 PM   #8277
Siberia is offline Siberia  Lithuania
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Quote:
Originally Posted by Salas View Post
Alright, let us know if it makes a better combo because I got one too. I may make it a same stage.
Nick, how do you find the sound of the cartridge? I own the same.
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Old 21st October 2012, 01:23 PM   #8278
Salas is online now Salas  Greece
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Good for Rock, dynamic. It can be tizzy if not a bit nose up on good arm.
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Old 21st October 2012, 01:32 PM   #8279
RCruz is offline RCruz  Switzerland
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Panic ? why should I panic ?

I guess for 7,5V on the base, 8.1v on the emitter is allright no ?
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Old 21st October 2012, 01:33 PM   #8280
AndrewT is online now AndrewT  Scotland
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0.6Vbe, if the polarity is correct, sounds just right.
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